Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Reexamination Certificate
2007-02-06
2007-02-06
Lipman, Bernard (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
C525S326400, C525S356000
Reexamination Certificate
active
10738083
ABSTRACT:
A method is provided for making a crosslinked polymer by direct fluorination of a non-perfluorinated polymer comprising first pendent groups which comprise sulfonyl halide groups or by direct fluorination of a polymer mixture of a first polymer which is a non-perfluorinated polymer and a second polymer which comprises first pendent groups which comprise sulfonyl halide groups. Such crosslinked polymers or polymer mixtures may be used to make polymer electrolyte membranes (PEM's) that may be used in electrolytic cells such as fuel cells and which should demonstrate increased durability in fuel cell use.
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3M Innovative Properties Company
Dahl Philip Y.
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